.xtnScroll {
  height: 100%;
  position: relative;

  // 顶部
  .xtn_topwrap {
    position: relative;
    text-align: center;
    display: none;
    transition: .2s;
    overflow: hidden;
    font-size: 12px;
    color: #999;
    line-height: 30px;

    .title {
      position: absolute;
      width: 100%;
      bottom: 0;
    }
  }

  // 底部
  .xtn_bottomwrap {
    position: relative;
    overflow: hidden;
    transition: .2s;
    text-align: center;
    color: #999;
    font-size: 12px;
    display: none;

    .title {
      width: 100%;
      display: -webkit-box;
      -webkit-box-align: center;
      -webkit-box-pack: center;
      height: 100%;
    }
  }
}
